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Finding the Fourth Proportional to 785.64, 1,084.31 and 486.92

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Solution

The fourth proportional to 785.64, 1,084.31 and 486.92 is: 672.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.64 : 1,084.31 = 486.92 : x
  2. Step 2: Convert to fraction form
    785.64/1,084.31 = 486.92/x
  3. Step 3: Cross multiply
    785.64x = 1,084.31 × 486.92
  4. Step 4: Simplify right side
    785.64x = 527,972.23
  5. Step 5: Solve for x
    x = 527,972.23/785.64
  6. Step 6: Final answer
    x = 672.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.